In this article, an integrated model with spatially distributed inertia and general boundary
conditions for the axial-torsional dynamics of a drill string is developed and studied. Based …

The drilling industry has substantially improved performance based on knowledge from
physics-based, statistical, and empirical models of components and systems. However, most …

We consider a distributed axial-torsional drill-string model with a rate-independent bit-rock
interaction law to study the occurrence and non-local characteristics of axial and torsional …

This paper extends the class of two degrees-of-freedom (2 DOF) models that simulate the
self-excited vibrations of a rotary drilling system, by considering PDC bits equipped with …

A distributed model of a drill string with a collars section is presented with Coulomb friction
as a distributed source term. This model is capable of replicating stick slip oscillations as …

Self-excited vibrations in drill-string systems are one of the main causes of failure and
efficiency reduction in drilling operations. To suppress these vibrations, an active control …

With the aim of enhancing the understanding of the complex dynamics of deep drilling, an
integrated model with complex time delays and Stribeck friction is presented for studies on …

In this article, a systematic linear parameter-varying (LPV) model and a gain-scheduled
control methodology for drill-string systems are proposed to analyze drill-string dynamics …

In this paper, a new model to study drill-string dynamics is developed. Some of the novelties
of the paper are:(1) the use of a new bit-rock interaction relation that does not restrict …

Stick–slip vibrations are widespread and hazardous phenomena in drilling practice. The
objective of this paper is to develop a simple and general control strategy to minimise such …